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File extension	.mp4
Category	Video File
Description	MP4 files (MPEG-4 Part 14) are multimedia files. MP4 is a container format that can store video, audio and subtitle data (as well as more depending on content). Since stores like iTunes uses this container format, and it is used with iPod and PlayStation Portable (PSP), MP4 files have become more common.
Actions	MP4 Converter View other video file formats
Technical Details	MPEG-4 Part 14 or MP4, formally ISO/IEC 14496-14:2003, is a multimedia container format standard specified as a part of MPEG-4. It is most commonly used to store digital video and digital audio streams, especially those defined by MPEG, but can also be used to store other data such as subtitles and still images. Like most modern container formats, MPEG-4 Part 14 allows streaming over the Internet. A separate hint track is used to include streaming information in the file. The only official filename extension for MPEG-4 Part 14 files is .mp4.
Associated programs	Apple QuickTime Player Apple iTunes Microsoft Windows Media Player VideoLAN VLC Media Player
Developed by	Moving Picture Experts Group
MIME type	audio/mpeg
Useful links	Detailed information on the MP4 File Format How to play MP4 files

File extension	.3g2
Category	Video File
Description	3g2 was originally developed by the 3rd Generation Partnership Project 2. It is an audio and video format for use on 3G phones. It can also be played on some 2G and 4G phones. It is designed for transmitting multimedia files over the internet and is mainly used for viewing videos on mobile phones. 3G2 is also known as 3GPP2 which is based on the MPEG-4 standard which was derived from Apple's QuickTime. You are probably familiar with it if you have an Iphone.
Actions	3G2 Converter View other video file formats
Technical Details	3g2 is very much like MPEG-4 Part 14 (MP4) but a much more simplified version of it. It is designed to reduce bandwidth requirements in order to accommodate mobile phones. It is also designed to decrease storage - it stores video streams as MPEG-4 Part 2 or MPEG-4 part 10. It stores audio streams such as AMR-WB, AMR-NB, AMR-WB+, HE-AAC or AAC-LC. The idea is that 3g2 stores and transfers the most significant bytes first.
Associated programs	Apple QuickTime Player VideoLAN VLC Media Player Microsoft Media Player Classic Totem GOM Player
Developed by	3rd Generation Partnership Project 2
MIME type	video/3gpp audio/3gpp
Useful links	Find out about more 3G technologies A handy troubleshooting guide for trying to open 3g2 files

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